Cooling system for vehicle engines



1955 F. K. H. NALLINGER 2,716,001

COOLING SYSTEM FOR VEHICLE ENGINES Filed March 29, 1951 INVENTOR FRIEDRICH K H- IVALLZWGER ATTIHUVEYS United States Patent 0 COOLING SYSTEM non VEHICLE ENGINES Friedrich K. H. Nallinger, Stuttgart, Germany, assignor to Daimler-Benz Aktiengesellschaft, Stuttgart-Unterturkheim, Germany Appiicafion March 29, 1951, Serial No. 218,133 In Germany February 4, 1950 Public Law 619, August 23, 1954 Patent expires February 4, 1970 7 Claims. (Cl. 237-123) The present invention refers to a cooling system for vehicle engines, and more particularly to motor vehicle engines, utilizing steam cooling, in which the cooling liquid, which is in the cooling jacket of the combustion engine, and which is particularly under pressure, is heated normally close to boiling temperature, and in which the steam, which is formed upon relieving, is emitted or separated from the cooling liquid and is conveyed back to the liquid cycle preferably upon condensation.

It is an object of the present invention to render such a cooling system particularly economical. For this purpose, particularly the steam, which is emitted from the cooling liquid, is conveyed to a heating device.

A further object of the present invention is concerned with suitably regulating the heating device.

A further object of the present invention is to provide n a construction of the cooling system, which is as simple as possible, particularly by utilizing a cooling liquid pump, which serves simultaneously for the emission of steam.

It is another object of the present invention to increase the economy of the cooling system by placing the liquid in the cooling system of the engine under pressure.

A further object of the present invention is furthermore concerned with such an arrangement of the steam drum and of the condenser that the steam can condense as quickly and completely as possible.

In the single view drawing there is shown a sketch of a cooling system in accordance with the present invention.

The conduit b leads from the engine a to the circulating pump 0, which is constructed as a centrifugal pump, and a conduit d leads back from the pump to the engine. The cooling liquid, for example cooling water, is under relatively high pressure forced into the cooling jacket of the engine, which cooling jacket is closed on all sides, where it is heated close to the boiling temperature, which corresponds to the existing overpressure.

The cooling liquid, which enters the pump 0 through the conduit 12, is centrifuged to the outside by the pump 0, while the steam remains in the center of the pump and is emitted at e in the middle of the axis of same and guided into the conduit 1. The conduit 1 leads to a heat exchanger g, for example, to a heater for heating the vehicle, in which the heat of the steam is radiated to the heating medium of the vehicle, for example fresh air. From the heat exchanger g the conduit h leads, for example through the upper part of a sump i, to the condenser k. A conduit l guides the condensation water from the condenser it back to the sump i, which, if so desired, can also be united with the condenser as one unit. Through a further conduit m with a conveyer pump n the cooling liquid is pumped from the container 1' into the conduit b, or conveyed back to the pump c, suitably under a small overpressure and discharged axially into the pump c, for example, by means of a nozzle 0, which discharges axially into the pump. Furthermore, provision can be made for a short-circuit line p, which permits, for example, during summertime to switch off the heat exchanger g or the heater by means of change-over cock q.

What I claim is:

1. In a radiator free liquid cooling system for a vehicle internal combustion engine having a closed in cooling liquid jacket, and a cooling circulation device, the improvement comprising a cooling liquid pump, a line leading to the pump and connecting the cooling liquid jacket directly with the pump, another line leading to the cooling liquid jacket connecting the pump directly with the cooling liquid jacket, said cooling liquid being circulated by said pump under high pressure from the cooling liquid jacket through said lines and said pump back to the cooling liquid jacket, means for separating steam in the pump, a heater for the vehicle connected in parallel to the aforesaid cooling circulation device, means to condense the steam, means for conducting the steam from the pump to the heater, and means for returning the steam used for this purpose as condensate to the cooling circulation device.

2. Cooling system in accordance with claim 1, wherein the last mentioned means comprise a return pump for conveying the condensation product back to the cooling circulation device.

3. In a radiator free cooling system for a vehicle combustion engine, the improvement comprising a cooling device for the engine, closed in means connected to the engine for conveying a cooling liquid normally heated by the heat of the engine close to the boiling point thereof, means for separating the resulting steam from the cooling liquid, a heating device for the vehicle, means for conveying to said heating device the heat from the separated steam, a sump, and a condenser, a conduit from the heating device to the upper part of the sump, a conduit from the upper part of the sump to the upper part of the condenser, one conduit from the lower part of the condenser to the lower part of the sump, and a conduit from the lower part of the sump to the cooling device of the engine.

4. Cooling system in accordance With claim 1, wherein said means for condensing the steam and for returning the condensate to the cooling circulating device comprise a sump, a condenser, a conduit from the heating device to the upper part of the sump, a conduit from the upper part of the sump to the upper part of the condenser, a conduit from the lower part of the condenser to the lower part of the sump, a conduit from the lower part of the condenser to the cooling liquid pump and a return pump in this conduit for guiding the condensation product back to the cooling liquid pump.

5. Cooling system in accordance with claim 1, furthermore comprising a sump, in which the steam is collected as a condensation product after its passage through the heating device, means adapted to guide the condensation product again back to the cooling device, a short-circuit line between said means for separating the steam and said sump, said line bypassing the heating device, and means for regulating the steam entry to the heating device or to the short-circuit line.

6. In a radiator-free circulating cooling system with a sump and with a cooling liquid for a vehicle internal combustion engine the improvement comprising means including a closed cooling jacket for placing said cooling liquid under increased pressure and for normally heating said cooling liquid by the heat of said engine close to the boiling point thereof, means in said first-mentioned means for separating the resulting steam from said cooling liquid and for directly returning the steamless cooling liquid to said cooling jacket in lay-passing relationship with said sump, a condenser, and means for returning the condensate of the steam to said cooling jacket only 'said cooling liquid being circulated by said purnp under pressure from the cooling liquid jacket through said lines and said pump back to said cooling liquid jacket, means connected with said pump for separating steam from said heated cooling liquid, a heater for the vehicle connected in parallel to said cooling circulation device, said heater having means to condense the steam, means for conducting the steam from the pump to the heater, and 7 means for returning the steam used for this purpose as condensate to the cooling circulation device.

References'Cited in the file of this patent UNITED STATES PATENTS 7 877,903 Butler Feb. 4, 1908 1,489,501 Miner Apr; 8; 1924 1,893,329 Hynes Jan 3, 1933 V FOREIGN PATENTS 521,577 Germany Mar. 24, 1931 761,316 France Jan. 3, 1934 

